Yanus, a significant figure within the Imperial Military of the reconstituted Sith Empire, held the rank of major. He was the commanding officer of the Toxi-Trooper Brigade, a specialized unit adept at fighting in harsh environments, including toxic worlds like the planet Quesh. After Ensign Raina Temple demonstrated her ability to withstand hostile environments during her time on Hoth, Yanus extended a personal invitation for her to transfer to his brigade; however, Temple declined the offer.